Buggy code:
public class BasicSearchEngine { private Parser parser ; private CompilerOptions compilerOptions ; private ICompilationUnit [ ] workingCopies ; private WorkingCopyOwner workingCopyOwner ; public static boolean VERBOSE = false ; public BasicSearchEngine ( ) { } public BasicSearchEngine ( ICompilationUnit [ ] workingCopies ) { } char convertTypeKind ( int typeDeclarationKind ) { } public BasicSearchEngine ( WorkingCopyOwner workingCopyOwner ) { } public static IJavaSearchScope createHierarchyScope ( IType type ) throws JavaModelException { } public static IJavaSearchScope createHierarchyScope ( IType type , WorkingCopyOwner owner ) throws JavaModelException { } public static IJavaSearchScope createJavaSearchScope ( IJavaElement [ ] elements ) { } public static IJavaSearchScope createJavaSearchScope ( IJavaElement [ ] elements , boolean includeReferencedProjects ) { } public static IJavaSearchScope createJavaSearchScope ( IJavaElement [ ] elements , int includeMask ) { } public static TypeNameMatch createTypeNameMatch ( IType type , int modifiers ) { } public static IJavaSearchScope createWorkspaceScope ( ) { } void findMatches ( SearchPattern pattern , SearchParticipant [ ] participants , IJavaSearchScope scope , SearchRequestor requestor , IProgressMonitor monitor ) throws CoreException { } public static SearchParticipant getDefaultSearchParticipant ( ) { } public static String getMatchRuleString ( final int matchRule ) { } public static String getSearchForString ( final int searchFor ) { } private Parser getParser ( ) { } private ICompilationUnit [ ] getWorkingCopies ( ) { } private ICompilationUnit [ ] getWorkingCopies ( IJavaElement element ) { } boolean match ( char patternTypeSuffix , int modifiers ) { } boolean match ( char patternTypeSuffix , char [ ] patternPkg , char [ ] patternTypeName , int matchRule , int typeKind , char [ ] pkg , char [ ] typeName ) { } public void search ( SearchPattern pattern , SearchParticipant [ ] participants , IJavaSearchScope scope , SearchRequestor requestor , IProgressMonitor monitor ) throws CoreException { } public void searchAllSecondaryTypeNames ( IPackageFragmentRoot [ ] sourceFolders , final IRestrictedAccessTypeRequestor nameRequestor , boolean waitForIndexes , IProgressMonitor progressMonitor ) throws JavaModelException { } public void searchAllTypeNames ( final char [ ] packageName , final int packageMatchRule , final char [ ] typeName , final int typeMatchRule , int searchFor , IJavaSearchScope scope , final IRestrictedAccessTypeRequestor nameRequestor , int waitingPolicy , IProgressMonitor progressMonitor ) throws JavaModelException { } public void searchAllTypeNames ( final char [ ] [ ] qualifications , final char [ ] [ ] typeNames , int matchRule , int searchFor , IJavaSearchScope scope , final IRestrictedAccessTypeRequestor nameRequestor , int waitingPolicy , IProgressMonitor progressMonitor ) throws JavaModelException { } public void searchDeclarations ( IJavaElement enclosingElement , SearchRequestor requestor , SearchPattern pattern , IProgressMonitor monitor ) throws JavaModelException { if ( BasicSearchEngine . VERBOSE ) { Util . verbose ( ( "<seq2seq4repair_space>-<seq2seq4repair_space>java<seq2seq4repair_space>element:<seq2seq4repair_space>" + enclosingElement ) ) ; } IJavaSearchScope scope = BasicSearchEngine . createJavaSearchScope ( new IJavaElement [ ] { enclosingElement } ) ; <START_BUG> IResource resource = enclosingElement . getResource ( ) ; <END_BUG> if ( enclosingElement instanceof IMember ) { IMember member = ( ( IMember ) ( enclosingElement ) ) ; ICompilationUnit cu = member . getCompilationUnit ( ) ; if ( cu != null ) { resource = cu . getResource ( ) ; } else if ( member . isBinary ( ) ) { resource = null ; } } try { if ( resource instanceof IFile ) { try { requestor . beginReporting ( ) ; if ( BasicSearchEngine . VERBOSE ) { Util . verbose ( ( ( ( "Searching<seq2seq4repair_space>for<seq2seq4repair_space>" + pattern ) + "<seq2seq4repair_space>in<seq2seq4repair_space>" ) + ( resource . getFullPath ( ) ) ) ) ; } SearchParticipant participant = BasicSearchEngine . getDefaultSearchParticipant ( ) ; SearchDocument [ ] documents = MatchLocator . addWorkingCopies ( pattern , new SearchDocument [ ] { new JavaSearchDocument ( enclosingElement . getPath ( ) . toString ( ) , participant ) } , getWorkingCopies ( enclosingElement ) , participant ) ; participant . locateMatches ( documents , pattern , scope , requestor , monitor ) ; } finally { requestor . endReporting ( ) ; } } else { search ( pattern , new SearchParticipant [ ] { BasicSearchEngine . getDefaultSearchParticipant ( ) } , scope , requestor , monitor ) ; } } catch ( CoreException e ) { if ( e instanceof JavaModelException ) throw ( ( JavaModelException ) ( e ) ) ; throw new JavaModelException ( e ) ; } } public void searchDeclarationsOfAccessedFields ( IJavaElement enclosingElement , SearchRequestor requestor , IProgressMonitor monitor ) throws JavaModelException { } public void searchDeclarationsOfReferencedTypes ( IJavaElement enclosingElement , SearchRequestor requestor , IProgressMonitor monitor ) throws JavaModelException { } public void searchDeclarationsOfSentMessages ( IJavaElement enclosingElement , SearchRequestor requestor , IProgressMonitor monitor ) throws JavaModelException { } }

Fix:
IResource resource = ( ( JavaElement ) ( enclosingElement ) ) . resource ( ) ;